It sounds like you might have plantar fasciitis, if you are active, a visit with the podiatrist could be in order. I don’t know that it is related to AI, but I have struggled with it for a while. It did not start until a few years after I completed endocrine therapy. I think if I had addressed it early on, instead of waiting it might be better.
There is a discussion about this, “plantar fasciitis, how did you get rid of it?”
https://connect.mayoclinic.org/discussion/plantar-fasciitis-1/
For the record, the best relief I get is with the tape support I learned from the physical therapist. I also use high quality inserts in my shoes and boots.